Role of blood type in determining paternity? - Dr. Sanjay Gupta

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The most common type of blood group we talk about is ABO. There are many types of blood groups but he most common we talk about is ABO and Rh factor. So you must have heard that a certain blood group of an individual is AB positive or O positive or B negative etc. So these are the examples of blood groups. We know the pattern of antigenicity of the antigens that they are carrying so that if necessary, they can either be a recipient or a donor. When it comes to paternity issue, it is not simple. When it comes to ABO or Rh factor are only a few of the blood group types. There can be many other more blood groups, which can also lead to interference and also the important factor of deciding the paternity. So in those older eras, few decades back, we were depending on this blood group. For example if a father is O blood group and a mother is B blood group and the child cannot be an AB blood group. Why so? It is because when a father is O blood group, he does not have the antigenicity of A blood group and mother is carrying B antigenicity. So the child cannot carry the A antigenicity in the blood group. These are the simple example to say that paternity can be decided from the blood group. So there are interferences, there are other blood groups. So it is not a foolproof method to actually determine paternity .So we have better and more advanced investigations and some of them are genetically oriented. So we do genetic tests, finger printing, chromosomal analysis and decide the paternity factor. So in a court of law it cannot be challenged that ABO factor or ABO blood group can be the determining factor for paternity. There has to be more specific, more sensitive investigations to determine paternity.
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Father is O positive mother is O positive child is B positive is possible???

gowthamm
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Is it possible for both parents having Type O blood to have a son with type A blood?

mariettalemery
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Well their has to be exceptions because I’m O+ and when my son was born they told me that he was AB-. The only reason they told me was because it was rare so they thought I should know. I’m the mother so no it’s somebody else’s he never left the room. Maybe they got his blood type wrong but I do know mine is O+

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